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便攜式紫外測油儀在脫水時(shí)要注意的事項有哪些</div> <div id="5tvd5pz" class="inside_rnewscon"> <h1 class="newsname">便攜式紫外測油儀在脫水時(shí)要注意的事項有哪些</h1> <li id="5hnr5l7" class="time" style="padding:15px 0; text-align:center; color:#b4b4b4;">更新日期：2022-08-30 信息來(lái)源：瀏覽次數：589</li> <ul class="dcont"> <p style="text-align: justify;"><div>　　<strong><a href="http://www.bivavg.com/SonList-2238104.html" target="_blank">便攜式紫外測油儀</a></strong>是在PH≤2的條件下，樣品中的油類(lèi)物質(zhì)被正己烷萃取，萃取液經(jīng)無(wú)水硫酸鈉脫水，再經(jīng)硅酸鎂吸附除去動(dòng)植物油類(lèi)等極性物質(zhì)后，于225nm波長(cháng)處測定吸光度，石油類(lèi)含量與吸光度值符合朗伯-比爾定律，從而定量分析水中石油類(lèi)的含量。（波數范圍：200-400nm）</div><div>　　正己烷的檢測是水質(zhì)石油類(lèi)監測的前提，而在新標準中對正己烷透光率的檢驗和脫芳處理做出了要求：使用前于波長(cháng)225nm處，以水做參比測定透光率，透光率大于90%方可使用，否則需進(jìn)行脫芳處理。</div><div>　　新標準中將萃取液采用加入無(wú)水硫酸鈉振搖脫水，同時(shí)注明也可采用將萃取液過(guò)10mm無(wú)水硫酸鈉的玻璃漏斗脫水。如果脫水不*，同樣會(huì )導致測量結果偏大。</div><div>　　便攜式紫外測油儀采用振搖方式脫水時(shí)，稱(chēng)取3g無(wú)水硫酸鈉到三角瓶中，蓋上蓋子，振搖數次，若中途發(fā)現無(wú)水硫酸鈉結塊，需補加無(wú)水硫酸鈉至不結塊為止。此種方法的優(yōu)勢是脫水的過(guò)程是密閉進(jìn)行的，不會(huì 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